Where It All Began – a celebration of the 100th anniversary of the founding of Cathedral Prep – will be held on Saturday, Nov. 8, at 5 p.m. Mass at St. Joseph Co-Cathedral, Prospect Heights. Auxiliary Bishops Paul Sanchez and Raymond Chappetto, both alumni of Cathedral College, Brooklyn, will be the main celebrants. St. Joseph’s is located two blocks from the original site of Cathedral Prep, 555 Washington Ave., which alumni will visit. To register, contact Tim McCleary at alumni@cathedralprepseminary.com or 718-592-6800, ext. 137 before Nov. 3.